I just ordered some Billy5100's for all four corners of my '09 taco. The front will be set at 2.5". Given that I don't aal, how much higher will my front sit than my rear? Will there be any performance issues without the aal?

I ran 5100's all around no prob front set @ 2.5" no aal i had no issues. The shocks actually leveled my truck out i didnt have the nose in the air but its different for most trucks. But there will be no performance issues.

im honestly confused now. some say they have 2.5 and 2" aal and they are about level, some say 2.5 and a 1.5" aal and they sit about level, and you say your level at 1.75.
i guess it all depends on the truck?

but if i were to just run 5100 up front for now what should i set them to to be some what level?

I couldent tell you maybe the .85 would look good. Im just going off of what mine looks like with 1.75 and the TSB AAL. I just wouldn't want you to set them at 2.5 and have your front higher than the rear and have to do the process again to get the look you want.